CME Group is the world's leading and most diverse derivatives marketplace offering the widest range of benchmark futures and options products available for risk management.
HTTP Header reponses of cmegroup.com is the information we get when HTTP request sent to a server from connecting clients(e.g. chrome, firefox). When you input an address into your browser it sends a request to the server hosting the domain and the server responds. HTTP Header information is not directly displayed by normal web browsers like chrome, firefox etc.